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Answer:
By "house", are you referring to brokers? Brokers earn from all this pip-making activities of ours through the spread, which is the difference between the bid and ask price. Of course, when you enter a trade, the broker has to match your position with an opposite one. For instance, if you shorted the eurusd pair, the broker will match this with a long eurusd trade. If you win your trade, the person who went long eurusd loses, and that's where you get your profits from.
